Pot for die casting machines



Jan. 25, 1938. H. MORIN POT FOR DIE CASTING-MACHINES Filed July 1, 1956 H gWw/H a 3 ,III-0N 7 INVENTOR LOUIS H. MUR/N 9./ ,g

l ATToRN Y Patented Jan. 25, 1938 Y Por F'oa mE CASTING Macnnvns Louis l-l. Morin, Bronx, N. Y., asslgnor to White' hall Patents Corporation, New York, N. Y., a

corporation of New York i Application July l, 1936, Serial-No. 88,3613

8 Claims.

This invention relates to die casting machines and particularly, the melting pot for melting the casting material employed in machines of this kind; and the object of the invention is to provide improved means for circulating the products of combustion from a burner through the pot in order to provide for the greatest possible transmission of heat units to-the pot and material therein and to reduce the exhaust or stack temperature so as to provide a very eiiicient and economical means for heating the casting material employed and for maintaining the same at a substantially constant temperature; a further object being to provide means for automatically controlling the burner operation to maintain a substantially fixed temperature of the casting material; a still further object being to provide means for circulating products of combustion forwardly and backwardly thrugh a melting pot and around the walls of said pot, the ilame or products of combustion being introduced into an open throat arranged beneath the pot and exf tending upwardly in the direction of one end thereof and then circulating around the side g walls of the pot and exhausted vertically at the other end thereof, means being provided for adf .ljustably and detachably supporting a burner nozzle in position to register with the admission throat of the combustion chamber; a still further object being to provide means for insulating the walls of the pot around the combustion chamber in order` to maintain the heat within the chamber and to prevent heat losses by radiation; and with these and other objects in view, the invention consists in a device of the class and for the purpose specified, which is simple in construction, elcient in use,'and which is constructed as hereinafter described and claimed.

- The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate'parts of my .improvement are designated by suitable reference characters in each of the views, and kin which:

Fig. 1 is a longitudinal, sectional view through a melting pot made according to my invention, diagrammatically illustrating. one' method of its use.

Fig. 2 is a section on the line 2--2 of Fig.' l on an enlarged scale; and,

Fig. 3 is asection on the line 3-3 of Fig.. 1 on an enlarged scale.

In the drawing, I have shown at 5 the melting pot of a die casting machine in which metals, alloys or other casting compounds may be placed to be melted and used in the formation of castings,

it being understood that a gooseneck or other discharging element will be employed as in other devices of this kind, which gooseneck is omitted solely for the purpose of simplifying the present 5 illustration.

The pot 5 consists of a bottom wall 6 having an upwardly'extending and inclined front wall l, the upper end of which terminates below the side walls 8 to i'orm an opening 8 for the discharge 10 end of the usual gooseneck. The rear wall I0 of the pot proper is of the irregular contour shown in cross section in Fig. 2 of the drawing, said wall being provided with a small vertical chamber II opening through the top oi the pot and in which l5 a pyrometer bulb I2 is adapted to be arranged as indicated in dotted lines in Fig. 1 of the drawing. Arranged outwardly of the walls 6, 1, 8 and I0 are supplemental walls 8a, 1a, 8a and I 0a. 'I'he wall 6a extendsoutwardly and downwardly to form a wide admission throat I3 for products of combustion which open into a, lower combustion chamber I 4 which extends between the walls 6, 6a, and 1, 'la and diverges into other circulating 25 chambers I6, `I5a betweenthe'walls 8, 8a. These chambers open into a common exhaust or ilue passage I6 arranged between the walls I II, Illa v and preferably of the cross sectional form seen in Fig. 2 of the drawing. The passage I6 opens 3o through the top oiy the pot and communicates with a ilue pipe or stack I'i which is coupled with the upper end of the pot as seen in Fig. 1, and will extend a sufilcient height to bring the exhaust above the top of the casting machine, or- 35 this pipe may be extended to a suitable outlet if desired.

Upon a consideration of Fig. 3 of the drawing, it will be seen that the passage Il extendsnot only across the bottom of the pot but also upwardly along the sides of the bottom wall 6 as is indicated at Ida. The pot 5 is arranged within and insulated from a casing I8 which is tubular in form, or, in other words, consists of side and end walls and is open at the top and bottom. 'Ihe pot 5 has an outwardly extending top wall I 9 which overlies the upper edge of the casing I8 and is secured thereto.

A packing sheet of asbestos 20 is disposed between adjacent surfaces of the parts I8 and I9 50 as clearly seen in Fig. 3 of the drawing. Powdered yor another form of asbestos 2| is disposed between the casing I8 and the Walls of the pot 5 as seen in Fig. 3 of the drawing, and a bottom plate 22 is employed to close the lower end of 86 the casing. This plate is oi a contour to conform with the contour oi the wall 0a and also includes a portion 22a arranged beneath that part of the pot having the chamber I6 therein as seen in Fig.-1 of the drawing. The bottom wall 22 is cut out or open as seen at 22h to register with the opening I3. At 23, I. have shown the burner nozzle which in the construction shown is in the i'orm of a gas burner nozzle and is supported at one end of a tubular mixing chamber 24 which is adiustably supported in connection with a bracket 25 bolted to the casing I8 as seen in Fig. 1 of the drawing so as to adjust the nozzle 2l toward and from the throat I3. At 28, I have shown an electric solenoid control valve arranged between the gas supply pipe 2l and the mixing chamber 24. The solenoid of the valve 26 is in an electric circuit represented by the wires 28 and 29 which is also in circuit with a pyrometer control 30, the latter being placed in communication with the bulb I2 through a bulb tube 3| as shown. With this construction, the supply of gas to the burner may be automatically controlled to maintain a substantially constant temperature of the casting material employed in the pot B, the valve elements 28a of the valve 26 being automatically opened and closed in this operation. At 32, I have shown a pilot pipe, the end oi which terminates at the nozzle 23 to provide a pilot light as is indicated at 33 for automatically igniting the burner whenever desired. The'pilot light is controlled by the valve 34,

In the operation of melting a suitable casting material in the pot 5 and maintaining this material at a constant temperature, the burner will be oper-ated from time to time through a given run of a casting machine and the burner will continue to operate until the desired temperature of the casting material is reached, after which the burner will be automatically shut oi and again automatically relighted when the temperature of the casting material is lowered to a predetermined degree or in the operation of replenishing the supply of the casting material tothe pot as and when it may be necessary so to do. In other words, the burner is not in constant operation, and in this way, a very economical means is provided for heating casting materials in the pot of casting machines of the kind under consideration. By means of the combustion and heat circulating chambers employed in the pot, a very eiiicient type of heat transfer is provided, thus providing the greatest amount of eillciency that is reasonably possible.

In the operation of the burner, the llame is applied directly to the bottom wall 6 of the pot, and spreads upwardly at either side at the lower portion of the pot or, in other Words, into the chambersv Ila, and then the products of combustlon pass backwardly along the side walls of the pot through the chambers I 5, I 5a into the chamber I 6 and then out through the stack I1. In operation, I have found that the stacked heat is very low by reason of the eilicient means of heat transmission employed.

Other types of burners may be employed in conjunction with my improved pot construction, and furthermore, the shape and contour of the pot may be modiiied to suit casting machines of various kinds and classes.

Having fully described my invention, what I claim as new and 'desire to secure by Letters Patent, is:

1. In a die casting machine, a pot for supplying heated casting material to a machine, said pot comprising a unitary body having spaced inner and outer bottom, side and end walls, the space between said walls forming a circulating chamber through which products of combustion may be circulated longitudinally of .the pot in at least two directions, the inner bottom wall bcing horizontally arranged, the outer bottom wall extending downwardly in the direction oi' one end of the pot and terminating in a ilared admission opening through which products of combustion may be introduced for circulation through said chamber, the inner bottom wall being directly exposed to the products oi combustion to provide direct heat transfer to the material contained within said pot, and means at the top oi the pot for discharging products of combustion from said chamber.

2. In a die casting machine, a pot for supplying heated casting material to a machine, said pot comprising a unitary body having spaced inner and outer bottom. side and end walls, thc space between said walls forming a circulating chamber through which products of combustion may be circulated longitudinally of the pot in at tending downwardly in the direction of onc end of the pot and terminating in a iiared admission opening through which products of combustion' at an upward inclination to the inner bottom wall oi the pot and relatively to the admission opening to said circulating chamber.

3. In a die casting machine, a pot for supplying heated' casting material to a machine, said pot comprising a unitary body having spaced inner and outer bottom. side and end walls, the space between said walls forming a circulating chamber through which products of combustion may be circulated longitudinally of the pot in at least two directions, the inner bottom wall being horizontally arranged, the outer bottom wall extending downwardly in the direction of one end of the pot and terminating in a flared admission opening through which products of combustion may be introduced for circulation through said chamber, the inner bottom wall being directly exposed to the products ol' combustion to provide direct heat transfer to the material contained within said pot, means at the top of the pot fo'r discharging products of combustion from said chamber, means at the first-named end of the pot for adjustably supporting a gas burner at an upward inclination to the inner bottom Wall of the pot andl relatively to the admission opening to said circulating chamber, the upper endo! the pot having outwardly extending ilanges, and means comprising a casing arranged in spaced relation to the walls of said pot coupled with said iianges for insulating said pot.

4. In a. die casting machine, a pot for supplying heated casting material toa machine, said pot comprising a unitary body having spaced inner and outer bottom, side and end walls,vthe space between said walls forming a circulating chamber through which products of combustion' f may be circulated longitudinally oi the pot in at least two directions, the inner bottom wall being horizontally arranged, the outer bottom wall extending downwardly in the direction of one end of the pot and terminating in a flared admission opening through which products of combustion may be introduced for circulation through said chamber, the inner bottom wall being directly exposed to the products of combustion to provide direct heat transfer to the material contained within said pot, said chamber opening outwardly through the upper end of the pot for the discharge of products of combustion from said chamber, and the inner wall of the pot at the other en d thereof being inclined upwardly and outwardly.

5. In a die casting machine, a pot for supplying heated casting material to a machine, said pot comprising a unitary body having spaced inner and outer bottom, side and end walls, the space between said walls forming a circulating chamber through which products of combustion may be circulated longitudinally of the pot in at least two directions, the -inner bottom wall being horizontally arranged, the outer bottom wall extending downwardly in the direction ofone' end of the pot and terminating in a flared admission opening through which products of combustion may b e introduced for circulation through said chamber, the inner bottom wall being directly exposed to the products of combustion to provide direct heat transfer to the material contained within said pot, said chamber opening outwardly through the upper end of the pot for the discharge of products of combustion from said chamber, the inner wall of the pot at the other end thereof beinga inclined upwardly and outwardly, an enlarged hollow body extending into the compartment of the pot at the firstnamed end` portion thereof, and said hollow body forming a receptacle for a temperature recording element.

6. In a die casting machine, a pot for supplying heated casting material to a machine, said pot comprising a unitary body having spaced inner and outer bottom-side and end walls, the

space between said walls forming a circulating chamber through which products of combustion may be circulated longitudinally of the pot in at least two directions, the inner bottom wall being horizontally arranged, the outer bottom wall extending downwardly in the direction of one end of the pot and terminating in a flared dimension opening through which products of combustion may be introduced for circulating through said chamber, said chamber opening outwardly through the upper end of the pot for the discharge oi' products of combustion from said chamber, a. casing encircling the pot in spaced relation to the side walls thereof, means for detachably supporting the casing in connection with the pot, a bottom cover plate for said casing, and a body of insulating material between the walls of said pot, casing and cover plate.

7. A container for the casting material of die casting machines, said container comprising a unitary body, means forming a vertical ue passage at one end of said body, the lower end of said body comprising spaced bottom walls forming therebetween an elongated circulating chamber extending longitudinally of the bottom of the container proper, said chamber having a downwardly ared admission opening and also extending on to the lower sides of the container, side walls of the container having circulating passages placing said vertical flue.passage in communication with said circulating chamber whereby products of combustion extending along and directly contacting the inner bottom wall of the container can be circulated through said passages and discharged through said ue to provide substantially direct heat transfer to the material in said containenand means comprising a casing detachable from said .container for insulating the exterior of the side and bottom walls of said container. i

8. A container for the casting material oi' die casting machines, said container comprising a unitary body, means forming a vertical flue passage at one end of said body, the lower end of said body comprising spaced bottom walls forming therebetween an elongated circulating cham'- ber extending longitudinally of the bottom of the container proper, said chamber having a downwardly flared admission opening and also extending on to the lowersides of the container, side walls of the container vhaving circulating .passages placing said vertical Ailue passage in communication with said circulating chamber whereby products of combustion extending along and directly contacting the inner bottom wall oi the container can be circulated through said passages and discharged through said ilue to provide substantially direct heat transfer to the material in said container, means comprising a casing detachable from said container for insulating the exterior of the side and bottom walls of said container, and means for supporting a burner in an upwardly inclined position with respect to the lower portion of the container with the discharge o1' said burner at the admission opening oi said circulating chamber.

e LOUIS H. MORIN. 

